Abstract
Several hybrid sol-gel formulations applied on tinplate were studied. The organic precursor was vinyltrimethoxysilane (VTMS) and the inorganic one was tetraethylorthosilane (TEOS). The characterization was performed by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and Fourier Transform Infrared Spectroscopy (FTIR). The optimization of the curing parameters was made by kinetics analysis based on Differential Scanning Calorimetry (DSC) measurements. The barrier properties were evaluated by Electrochemical Impedance Spectroscopy (EIS) technique.The results indicated that only sol-gel solutions with high inorganic precursor ratios are able to form a continuous film, necessary to provide good barrier properties. Thus, tinplate coated with 25% VTMS and 75% TEOS formulation exhibited the better protection properties in the studied medium.
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